The cube

The cube and cylinder weigh the same as three 20-gram weights. Three cubes and one cylinder weigh the same as two cylinders and one cube. How many grams does one cube weigh (and one cylinder)?

Correct answer:

k =  20 g

Step-by-step explanation:

k+v = 3•20
3k+v = 2v+k

k+v = 3•20
3•k+v = 2•v+k

k+v = 60
2k-v = 0

k = 20
v = 40

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